Pension Plans and Other Postretirement Benefit Plans - Pension Plans and Other Postretirement Benefit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Funded status of fully funded, underfunded, and unfunded pension plans:
Overfunded defined benefit pension plans	$ 6.4		$ 6.4		$ 5.7
Unfunded defined benefit pension plans	424.3		424.3		433.1
Pension liabilities included in other current liabilities	14.3		14.3		14.7
Net funded status	(432.2)		(432.2)		(442.1)
Underfunded Plan
Funded status of fully funded, underfunded, and unfunded pension plans:
Unfunded defined benefit pension plans	68.4		68.4		67.1
Unfunded Plan [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Unfunded defined benefit pension plans	355.9		355.9		$ 366.0
United States
Funded status of fully funded, underfunded, and unfunded pension plans:
Defined Benefit Plan, Service Cost	3.9	$ 4.9	11.8	$ 14.6
Defined Benefit Plan, Interest Cost	9.6	10.3	28.7	30.9
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(12.1)	(14.5)	(36.2)	(43.6)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.2)	(0.2)	(0.5)	(0.5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1.2	0.5	3.8	1.4
Foreign Plan [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Defined Benefit Plan, Service Cost	2.2	2.3	6.5	7.2
Defined Benefit Plan, Interest Cost	1.4	1.3	4.1	3.8
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(0.3)	(0.3)	(0.7)	(0.8)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 3.3	$ 3.3	$ 9.9	$ 10.2